/* 基础样式 */
* {
    box-sizing: border-box;
}

body {
    font-family: Arial, sans-serif;
    background-color: #faf8ef;
    color: #776e65;
    margin: 0;
    padding: 20px;
}

.container {
    max-width: 500px;
    margin: 0 auto;
    text-align: center;
}

h1 {
    font-size: 48px;
    font-weight: bold;
    margin: 0;
    display: block;
    color: #776e65;
}

.header {
    display: flex;
    justify-content: space-between;
    margin-top: 10px;
    margin-bottom: 20px;
}

.score-container, .best-score-container {
    background: #bbada0;
    padding: 10px 15px;
    border-radius: 3px;
    color: white;
    font-size: 20px;
    font-weight: bold;
}

.game-container {
    background: #bbada0;
    padding: 15px;
    border-radius: 6px;
    margin-bottom: 20px;
    position: relative;
}

.grid-container {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    grid-gap: 10px;
    width: 100%;
    height: 400px;
}

.cell {
    background: rgba(238, 228, 218, 0.35);
    border-radius: 3px;
    display: flex;
    justify-content: center;
    align-items: center;
    font-size: 30px;
    font-weight: bold;
}

.cell-2 { background: #eee4da; }
.cell-4 { background: #ede0c8; }
.cell-8 { background: #f2b179; color: white; }
.cell-16 { background: #f59563; color: white; }
.cell-32 { background: #f67c5f; color: white; }
.cell-64 { background: #f65e3b; color: white; }
.cell-128 { background: #edcf72; color: white; font-size: 25px; }
.cell-256 { background: #edcc61; color: white; font-size: 25px; }
.cell-512 { background: #edc850; color: white; font-size: 25px; }
.cell-1024 { background: #edc53f; color: white; font-size: 20px; }
.cell-2048 { background: #edc22e; color: white; font-size: 20px; }

.controls {
    margin-bottom: 20px;
}

.controls button {
    background: #8f7a66;
    color: white;
    border: none;
    border-radius: 3px;
    padding: 10px 15px;
    margin: 0 5px;
    font-weight: bold;
    cursor: pointer;
    font-size: 16px;
}

.controls button:hover {
    background: #9f8a76;
}

.instructions {
    font-size: 14px;
    color: #776e65;
}